A nice review article is available to summarise of all the complications of subarachnoid haemorrhage. Particularly, Figure 1 represents the risk of complications as a percentage incidence. For instance, fever is present in up to 80% of SAH patients. The mortality from these various medical complications (like aspiration pneumonia, pulmonary oedema, renal failure, etc etc) among low-grade SAH is about the same as the mortality from the SAH itself.
The unsecured aneurysm will bleed again within the first 24 hours, and the second bleed is usually more severe. The rate of rebleeding within the first 24 hours is usually quoted as around 4-17%.
In view of this, the aneurysm should be dealt with as soon as is permitted by the neurosureon's availability.
This tends to occur after the first 24 hours. the cuase of hydrocephlus in this case is not the obstruction of the 4th ventricle, but rather a diffuse blockage of arachnoid granulations, preventing the resorption of CSF. Naturally, a sensible response to this would be to insert an EVD, and subsequently a VP shunt.
Chapter 51 (pp. 568) Acute cerebrovascular complications by Bernard Riley and Thearina de Beer
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LITFL offer this reference as a follow-on to their chapter:
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